Methods: A randomized controlled effectiveness trial comparing single-dose tinidazole plus fluconazole (TF) to seven days of metronidazole plus three days of vaginal clotrimazole (MC) among 1570 women presenting with vaginal discharge in primary health care institutions of Ghana, Togo, Guinea and Mali. Participants were randomly allocated to one of the two treatments by research nurses or physicians using pre-coded envelopes. Effectiveness was assessed by symptomatic response on day 14.